# A Phase 3 Study of Revaccination in Subsequent Pregnancies With Bivalent RSV Vaccine and Duration of Protection of a Single Dose

> **NCT06866405** · PHASE3 · RECRUITING · sponsor: **Pfizer** · enrollment: 550 (estimated)

## Conditions studied

- RSV Infection

## Interventions

- **BIOLOGICAL:** RSVpreF
- **BIOLOGICAL:** Placebo

## Key facts

- **NCT ID:** NCT06866405
- **Lead sponsor:** Pfizer
- **Sponsor class:** INDUSTRY
- **Phase:** PHASE3
- **Study type:** INTERVENTIONAL
- **Status:** RECRUITING
- **Start date:** 2025-04-16
- **Primary completion:** 2028-02-24
- **Final completion:** 2028-02-24
- **Target enrollment:** 550 (ESTIMATED)
- **Last updated:** 2026-05-15


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT06866405

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT06866405, "A Phase 3 Study of Revaccination in Subsequent Pregnancies With Bivalent RSV Vaccine and Duration of Protection of a Single Dose". Retrieved via AI Analytics 2026-06-25 from https://api.ai-analytics.org/clinical/NCT06866405. Licensed CC0.

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*[Clinical trials dataset](/datasets/clinical-trials) · CC0 1.0*